Expert Alien
Complete the Game on Hard Difficulty.
20 ✓ September 12th, 2010
Mad Hatter
Unlock all of the 31 hats that are in the game.
20 ✓ September 12th, 2010
Adult Alien
Complete Game on Medium Difficulty.
15 ✓ September 12th, 2010
Killing Spree
Kill 1000 enemies during one game.
15 ✓ September 12th, 2010
Hungry Yeti
Eat 50 KGB Agents with the Yeti.
10 ✓ September 12th, 2010
City Destroyer
Destroy 25 buildings during one game.
10 ✓ September 13th, 2010
Juvenile Alien
Complete the Game on Easy Difficulty.
10 ✓ September 12th, 2010
Alien in Training
Complete Level 1-1 of the game.
5 ✓ September 7th, 2008
Perfect Fight
Defeat the Final Boss without using a continue.
30 
Survivalist
Survive any challenge mode for 20 minutes.
25 
WMD
Reach 5000 Km in Super Soviet Missile Mastar.
20 
Head Chomper
Head bite 50 enemies without touching the ground or firing.
20